99% of the time, when your weights stall like this, it has nothing to do with programming. It has to do with form inconsistancies or real life getting in the way(nutrition, sleep, circadian hormonal release, or a billion other things). My bench has sucked for a while now as well. Mostly because I am stubborn and did not think my form was the problem. Fixed that now I will be smashing a PR at my next meet. Be honest with yourself. Followin a long term, well laid plan usually takes years before benefits cease.
Everyone hates that answer. Switching a program or doing "insert whatever exercise here" instead of "insert whatever exercises here" is easy and an instant fix. Being honest with yourself and mastering your form are much harder skills to develop.